Speed drops while generating resume data

[khaosryder]

While seeding/downloading a large number of torrents (~200, but issue starts appearing with much fewer torrents), upload and download speed drops to 0 every time Deluge is generating resume data, which happens every 3-4 minutes. After resume data for all torrents is generated, speed picks back up slowly as it looks like it has to reconnect to all peers, only to happen again a few minutes later.

The logs contain the following data for every torrent file:

[DEBUG   ] 20:35:42 alertmanager:123 save_resume_data_alert: torrent_name1 resume data generated
[DEBUG   ] 20:35:42 alertmanager:123 save_resume_data_alert: torrent_name2 resume data generated
[DEBUG   ] 20:35:42 alertmanager:123 save_resume_data_alert: torrent_name3 resume data generated
[DEBUG   ] 20:35:42 torrentmanager:1106 on_alert_save_resume_data
[DEBUG   ] 20:35:42 torrentmanager:1106 on_alert_save_resume_data
[DEBUG   ] 20:35:42 torrentmanager:1106 on_alert_save_resume_data

And it goes on like this for all torrents which takes ~10 seconds, then transfer speeds start going back up.

Here is an example speed graph (5 sec update frequency):

[Bro]

This may be due to blocking disk I/O when saving the fastresume file. ​PR79 implements performing task on a separate thread which may solve the issue.

[Calum]

Shall consider this fixed by [7c20ed777]

[khaosryder]

It's not, I've simply learned to live with it.

[Calum]

You have tested with develop code?

[Calum]

Milestone renamed